janitza UMG 512, Operation Manual And Technical Data

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39
UMG 512
Bus structure
• All devices are connected in a bus structure (line)
and each device has its own address within the bus
(see also Parameter programming).
• Up to 32 subscribers can be connected together
in a single segment.
• The cable is terminated with resistors (bus termination
120Ohm, 1/4W) at the beginning and at the
end of a segment.
• With more than 32 subscribers, repeaters (amplifiers)
must be used to connect the individual segments.
• Devices for which the bus connection is switched
on must be under current.
• It is recommended that the master be placed
at the end of a segment.
• If the master is replaced with a bus connection,
the bus must be switched off.
• Replacing a slave with a bus connection that is either
switched on or de-energised can destabilise the bus.
• Devices that are not connected to the bus can be
replaced without destabilising the bus.
Fig. Bus structure
Slave Slave Slave
Slave Slave Slave Repeater
Slave Slave Slave Slave
Master
Speisung notwendig / power supply necessary
Busabschluß eingeschaltet / bus terminator on
T
T
T
T
T